<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    #noscript {
      height: 1000px;
      background: black;
      color: cornsilk;
      text-align: center;
      line-height: 1000px;
    }
  </style>
</head>
<body>
  <noscript>
    <div id="noscript">本页面需要支持 JavaScript</div>
  </noscript>
  <p>正常页面</p>
</body>
</html>